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June 14, 1938. G.` W. YANNEY 2,120,792 CRANE DRIVE Filed June 1‘7, 1936 WW 2 Sheets-Shag?. 1 NW wm..NN. NNl @w w @N1 INVENTOR ' June 14, 1938. G. w. YANNEY 2,120,792 CRANE DRIVE Filed June 17, 193s 2 Sheets-Sheet 2 25 INVENTOR M',MM/M' 2,120,792 Patented June 14, 1938 UNITED STATES rATENT OFFICE 2,120,792 CRANE DRIVE George W. Yanney, Alliance, Ohio, assignor to The Alliance Machine Company, Alliance, Ollio, a corporation of Ohio Application June 17, 1936, Serial No. 85,708 8 Claims. (Cl. 10E-29) This invention relates to a drive for cranes and similar structures, and particularly for cranes of the bridge and gantry type. It is customary to drive gantry cranes by a 5 pinion at the foot of each supporting trestle, co operating with racks mounted alongside the track rails on which the wheels supporting the crane travel. A so-called “squaring shaft”, including vertical shafts, a horizontal cross shaft and suit l0 able bevel gearing, connects the drive pinions so that they move in synchronism and maintain the longitudinal axis of the crane precisely perpen dicular to the track rails at all times. Occasionally, because of local conditions, it is desirable that a crane traverse a path including a curved portion. It is an object of this inven tion to provide a drive for a bridge or gantry crane adapted to traverse curved paths where by the longitudinal axis of the crane is main 20 tained in a true radial position at all times while the crane is traversing the curved portion of its path. In accordance with my invention, I pro vide, in addition to the usual racks along the straight portions of the path and the driving p-inions on the crane trestle cooperating there with, an additional rack along the curved por tion of the track, at the outside thereof, and an additional pinion on the crane at the, end there of on the outside of the curve, for meshing with 30 said last-mentioned rack. This rack and pinion have a greater tooth pitch than the racks along the straight portions of the track, and the pin ions cooperating therewith. The additional pin ion is driven by the same mechanism which drives the usual pinions and moves at the same angular velocity as the latter. It is preferably spaced axially from the usual driving pinion on the end of the crane adapted to traverse the out side of the curve. For a complete understanding of the inven 40 tion, reference may be had to the accompanying drawings which illustrate a present preferred embodiment. In the drawings, Fig. 1 is a diagrammatic plan view showing a gantry crane and a track along which it is adapted to travel, including straight and curved portions; Fig. 2 is a partial side elevation of a crane; Fig. 3 is a partial end View of one of the crane trestles, to enlarged scale; Fig. 4 is a sectional View along the line IV-VI of Fig. 3; and Fig. 5 is a View similar to Fig. 4 showing the drive for the opposite end of the crane. Referring now in detail to the drawings, a gan try crane IIB comprises a bridge, a portion of which is shown at II, and supporting trestles I2 and I3. The lower ends of the trestles rest on sills I4 and I5, preferably composed of structural shapes fabricated according to well known designs. Four-wheel trucks I6 (see Fig. 3) are swivcled to each end of both sills and are adapted to travel along a track I'I. The track includes straight sections I3 and I9 connected by a curved section 2|), the track rails on the inside of the curve being indicated at 2| and those on the outside of the curve at 22. The points of tangency between the straight and curved portions of the track are indicated by the dot-and-dash lines I8’ and I9'. ~ Racks 23 and 24 extend along the inside and outside rails 2| and 22, respectively, throughout the straight sections I8 and I9. A similar rack 25 extends along the inside rail 2| throughout the curved portion 2E! of the track. The racks 23, 24 and 25 may conveniently be disposed be tween the track rails 2| and 22 and supported in any convenient manner (not shown). The rack 25, of course, is simply a continuation of the racks 23 except that it is curved instead of 25 straight as are the latter. Referring now more particularly to Figs. 4 and 5, a driving motor 26 is mounted on each sill I4. By means of reduction gearing 21, each motor drives an intermediate shaft 28 journaled in - suitable bearings 29 mounted on the sills I4. Pin ions 3|) on the shafts 28 drive gears 3| keyed to driving shafts 32 journaled in suitable bearings 33 carried by the structural shapes forming the sill and indicated at 34. Pinions 35 are keyed to the shafts 32 and mesh with driving pinions 36 keyed to shafts 36a journaled in bearings 31 mounted in bearing brackets 38 suspended below the sills I4. The pinions 36 mesh with the racks 40 23, 24 and 25. Vertical shafts 39 journaled in suitable bear ings carried on the trestles I2 and I3 are driven from the shafts 28 by bevel gearing 40. The shafts 39 are connected by a horizontal cross shaft 4| extending therebetween and journaled in suitable bearings 42 carried on the bridge II, and bevel gearing 43. By this means, the driv ing pinions 36 move at the same angular veloc ity, even though each has its own driving motor, and the trestles I2 and I3 always move at the same speed, while traveling along straight stretches of track. This maintains the longitu dinal axis of the crane precisely perpendicular to the track rails, and prevents binding of the sup porting wheels or derailment of the trucks I6. 55 2 2,120,792 As will be seen by comparison of Figs. 4 and 5, porting wheels spaced axially from each other the drives for the two ends of the crane are identical to a large extent. The drive for the end of the crane adapted to traverse the outside and adapted to traverse track rails having a curve therein, of means for driving the crane of the curved portion 20 of the track, however, is provided with an additional driving pinion 44 keyed to the shaft 36a on which the pinion 36 is mounted. The pinion 44 is thus spaced axially along the rails, including means for driving the end of the crane on the outside of the curve at a linear speed greater than that of the end of the crane on the inside of the curve whereby to main from the pinion 35 for cooperation with a rack' tain the crane in a truly radial position at all times while traversing the curve. 45 extending throughout the curved portion of the track along the outside rails. The pinion 44 has a greater diameter than the pinions 36, but porting wheels spaced axially from each other has the same number of teeth which means sim ply that pinion 44 has a greater tooth pitch than 15 pinions 36. The rack 45 diii‘ers similarly in pitch from the racks 23, 24 and 25. Since the pinion 44 is mounted on the same `shaft as the pinion 36 at the end of the crane traversing the outside of the curve, the pinion144 will make one revolu 20 tion for every revolution of the pinions 36. The pinion 44, however, when it engages the rack 45, as the crane moves from either of the straight portions or tangents I8 and ’I9 onto the curved portion 20 of the track, will cause the end of the 25 crane traversing the outside of the track to move at a linear speed greater than that at which the end of the crane on the inside of the curve moves. The difference between the diameters of the pin ions 44 and 36, of course, is dependent on the 30 curvature of the curved portion 20 of the track and may easily be determined mathematically. 2. The combination with a crane having sup and adapted to traverse track rails having a curve therein, of means for driving the crane along the rails, and means eiîective when the crane trav erses the curve, to drive the end of the crane on 15 the outside of the curve at a higher linear speed than the end of the crane on the inside of the curve. 3. A gantry crane having supporting trestles at each end, track Wheels at the foot of each 20 trestle, adapted to traverse a track having straight and curved- portions, a driving pinion carried on each trestle for cooperation with fixed racks extending along the straight portions, of the track, means for driving the pinions concur rently at the same speed, a rack on the out last-mentioned rack, said last-mentioned pinion of the crane on the outside of the curve moves also being driven by said driving means. length of curved track rail. The longitudinal axis of the crane is thereby maintained in a true 40 radial position relative to the curved track por tion at all times While traversing the curve. It will be observed that the racks 23 and 24 terminate at the ends of the rack 45.V The transi tion from the straight portion of the track to the 45 curved portion, or vice versa, is thereby easily made. The racks 24 and 45 overlap the lines I8' and I9’ deñning the curved portion 20 of the track because the driving shaft 36a is not dis posed centrally of the trestle I2, but oit-center 50 thereof, adjacent one leg of the trestle as shown in Fig. 3. By this arrangement, the change from either of the racks 24 to the rack 45 is made precisely at the time the central vertical plane through the crane passes the boundary lines I8' 55 and I9’. r It will be clear from the foregoing description that the invention makes it feasible to operate bridge or gantry cranes over tracks including curved portions. The limitation in the move 60 ment of bridge or gantry cranes to straight paths is thus removed. A crane may even be caused to traverse a reverse curve by providing the ad ditional rack on the outside of each curve and the additional driving pinion on both ends of the To meet such conditions, it would only be necessary to substitute the structure of Fig. 5 for that shown in Fig. 4. Although I have illustrated and described here in but'one preferred embodiment of the inven 70 tion, it will be apparent that changes in the con struction disclosed may be made without depart ing from the spirit of the invention or the scope of the appended claims. I claim: 1. The combination withV a crane having sup 65 crane. 25 side of the curved portion of the track having a tooth pitch greater than that of the racks along the straight portions of the track, and a pinion on the trestle traversing the outside of the curved 30 portion of the track adapted to mesh with said As a result of the construction described, the end faster than the end on the inside, so as to trav 35 erse the greater length of the track rails 20 on the outside of the curve in the same time that the inner end of the crane traverses its shorter 10 4. A drive for a movable structure having sup porting wheels spaced axially apart and adapted to traverse a path having straight and curved portions, comprising a rack adjacent one end of the structure extending along the straight and curved portions of said path, a second rack ad jacent the other end extending along the straight 10 portion only of the path and terminating at the curved portion thereof, pinions of the same size and pitch journaled in said ends meshing with said racks, means for driving said pinions at the same angular velocity, a third rack extend ing along the curved portion only of said path at 45 the same end of the structure as said second rack, and a, pinion meshing with said third rack and connected with said ñrst mentioned pinions so as to rotate .at the same angular velocity but having 50 a pitch different from that of the ñrst mentioned pinions. 5. An elongated wheeled structure move/ble sidewise along a path including straight and curved portions having driving pinions mounted 55 on each end meshing with ñxed racks, one of which terminates at said curved portion, means connecting the pinions whereby they operate to move both ends of the structure at the same Speed while traversing said straight portion, a 60 rack along said curved portion, and a pinion on said structure meshing therewith when the latter reaches` said curved portion, said last mentioned rack and pinion being eiïective to move one end of said structure at a lineal speed different from 65 that at which the other end is moved by its rack and pinion. 6. The apparatus defined by claim 5, charac terized by said last mentioned rack and pinion having a tooth pitch differing from that of the 70 first mentioned racks and pinions. 7. A crane movable along rails, having a drive comprising driving pinions on both ends of the crane cooperating with fixed spaced racks ad jacent said rails, means connecting said pinions 75 3 2,120,792 whereby to move both ends of the crane at the same speed, and an additional rack adjacent a curve in the rails and a third pinion journaled on one end of the crane to cooperate with said addi tional rack for driving said end of the crane at a linear speed different from that at which the other end is driven to maintain the crane radial when traversing said curve, the ñrst mentioned rack on the end adjacent said additional rack w terminating where the lattei` begins. 8. An elongated movable structure having driv ing pinions at both ends cooperating with ñxed spaced racks, said pinions being connected by a squaring shaft, ‘and an additional pinion coop erating with a further fixed rack lying along a curved portion of the path of the structure to Ui move the end thereoi on the outside of the curved portion at a greater linear speed than the end on the inside, the ñrst mentioned rack on the end adjacent the additional rack terminating Where 10 the latter begins. » GEORGE W. YANNEY.